Can you guys give me an average size estimate for adult Dubia's?

My frogs are tiny right now, so roaches might not be an option until they are older. I'm not sure if my parents would be too keen on it, but I'll convince them anyhow

Does anyone know of a guide/sheet on how to breed Dubia roaches, or crickets? I've been trying to breed crickets with no success for a while now.

I'm not sure about their legality in my area. I'll go check. Cross my fingers.